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#include <Drivers.h>
#include <KernelExport.h>
#include <OS.h>
#include <SupportDefs.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "plex86.h"
#include "monitor.h"
#define read_flags() ({ \
unsigned int __dummy; \
__asm__( \
"pushfl\n\t" \
"popl %0\n\t" \
:"=r" (__dummy)); \
__dummy; \
})
#define write_flags(x) \
__asm__("push %0\n\tpopfl\n\t": :"r" (x))
struct cookie {
sem_id sem;
int mon_ok;
uint32 irq_cnt[17];
};
static status_t
driver_open(const char *name, ulong flags, void **_cookie)
{
struct cookie *cookie;
status_t err;
cookie = calloc(sizeof(*cookie), 1);
if (!cookie)
return ENOMEM;
cookie->sem = create_sem(1, "plex86 mutex");
if (cookie->sem < 0) {
err = cookie->sem;
goto err1;
}
*_cookie = cookie;
return B_OK;
err1:
free(cookie);
return err;
}
static status_t
driver_close(void *cookie)
{
return B_OK;
}
static status_t
driver_free(void *_cookie)
{
struct cookie *cookie = (struct cookie *)_cookie;
delete_sem(cookie->sem);
free(cookie);
return B_OK;
}
static status_t
driver_read(void *cookie, off_t pos, void *buf, size_t *count)
{
return B_OK;
}
static status_t
driver_write(void *cookie, off_t pos, const void *buf, size_t *count)
{
return B_OK;
}
static status_t
driver_ioctl(void *_cookie, ulong cmd, void *buf, size_t len)
{
struct cookie *cookie = (struct cookie *)_cookie;
uint32 cr0, arg, eflags_orig;
uchar soft_int_vector;
status_t err;
arg = *(uint32 *)buf;
switch (cmd) {
/* Allocate unpaged memory for the VM. */
/* arg is the number of megabytes to allocate */
/* Memory returned must not be pageable by the */
/* host OS, since the VM monitor will run in this */
/* memory as well. Perhaps later, we can let */
/* the guest OS run in paged memory and reflect */
/* the page faults back to the host OS. */
case 0x6b02:
acquire_sem(cookie->sem);
init_monitor(MASTER_PIC_BASE_VECTOR, SLAVE_PIC_BASE_VECTOR, IRQ16_BASE_VECTOR);
cookie->mon_ok = 1;
release_sem(cookie->sem);
return B_OK;
case 0x6b03:
/* linux-specific hack, unnecessary under BeOS */
return B_OK;
/* run guest context for a time slice */
case 0x6b04:
{
cpu_status ps;
acquire_sem(cookie->sem);
if (!cookie->mon_ok) {
release_sem(cookie->sem);
return EPERM;
}
ps = disable_interrupts();
/* clear NT/IF/TF */
eflags_orig = read_flags();
write_flags(eflags_orig & ~0x00004300);
__host2guest();
write_flags(eflags_orig & ~0x00000200);
restore_interrupts(ps);
switch ( monitor_info.ret_because ) {
case RET_BECAUSE_IRQ:
/* reported vector is actually the IRQ# */
soft_int_vector = MASTER_PIC_BASE_VECTOR + monitor_info.vector;
soft_int(soft_int_vector);
cookie->irq_cnt[monitor_info.vector]++;
dprintf("plex86: irq %u\n", monitor_info.vector);
err = B_OK;
break;
case RET_BECAUSE_INT:
dprintf("plex86: int %u\n", monitor_info.vector);
err = EFAULT;
break;
case RET_BECAUSE_EXC:
dprintf("plex86: exc %u\n", monitor_info.vector);
err = EFAULT;
break;
case RET_BECAUSE_TEST:
dprintf("plex86: test\n");
err = B_OK;
break;
default:
dprintf("plex86: unknown ret_because\n");
err = B_OK;
break;
}
release_sem(cookie->sem);
return err;
}
case 0x6b05: /* tear down VM environment */
acquire_sem(cookie->sem);
cookie->mon_ok = 0;
release_sem(cookie->sem);
return B_OK;
}
return ENOSYS;
}
device_hooks driver_device = {
driver_open,
driver_close,
driver_free,
driver_ioctl,
driver_read,
driver_write
};
status_t
init_driver (void)
{
return B_OK;
}
void
uninit_driver(void)
{
}
const char **
publish_devices(void)
{
static const char *driver_names[] = {
"misc/plex86",
NULL
};
return (const char **)driver_names;
}
device_hooks *
find_device(const char *name)
{
return &driver_device;
}
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